English to English

noun (n)

• applies to nonhuman mammals: a state or period of heightened sexual arousal and activity(noun.state)

  Synonym:
  estrus, heat, rut
  Antonym:
  anestrum, anestrus, anoestrum, anoestrus
  

  source: wordnet30
• type genus of the Oestridae: sheep botflies(noun.animal)

  Synonym:
  genus oestrus
  

  source: wordnet30